Electronic bracelet

Hello I am a beginner in arduino I would like to make an electronic bracalet for the remote monitoring of a person located in a well defined area. I want a user to be alerted by an SMS and a triggering of the sound if the wearer of the bracelet deviates from the authorized permit. I wish to put it at the foot of the wearer. help me identify the possible materials especially the way I can put them together to produce a real electronic bracelet

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